JPS6171118A - Opening revision control method of edger mill roll - Google Patents

Abstract

PURPOSE:To perform the control of an opening revision with good accuracy by giving to the arithmetic unit of the opening revising quantity of an edger mill roll the plastic constant calculated from the opening variation quantity since the starting time of the width rolling of a slab and the variation quantity of the width rolling load. CONSTITUTION:The roll opening of an edger mill 1 is controlled with revision via an opening revising device 5 based on the functional command transmitted from a function generation command device 4 at the width rolling time of the tip part (and rear end part) of a slab 3 when the slab 3 is fed to the edger mill 1. At the width rolling time of the medium part of the slab 3 the detected value being from a roll opening detector 6 and width rolling load detector 7 is taken in with a variable sampling period and the quotient of the both is operated, also those are averaged. The operated value of the plastic constant being from the plastic constant operating device 9 operating the plastic constant of the slab 3 is then given to the operating device 8 of the opening revising quantity and the roll opening of the edger mill 1 is revised and controlled via the opening revising device 5 with the operated value of the opening revised quantity by the device 8.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for controlling the opening degree of an edger mill roll in, for example, a slab rough rolling line.

``Prior art'' When width rolling a slab by an edger mill in a rough rolling line, the width of the edger mill roll is measured using a gauge meter based on the opening III movement of the edger mill roll and the width rolling load from the start of width rolling of the slab. When width rolling is performed over the entire length of the slab by a method of correcting and controlling the opening of the edger mill roll via the opening correction device based on the calculated value of the opening correction amount calculation device that calculates the opening correction amount, Because the plastic deformation characteristics at the leading and trailing ends of the slab are different from those at the middle of the slab, and because width fluctuations occur rapidly in a short period of time, a sufficient deformation control effect cannot often be obtained.

Therefore, conventionally, when rolling the width of the leading and trailing ends of slabs, which cause sudden width fluctuations, the opening of the edger mill roll was corrected via an opening correction device based on a function command from a function generation command device. During width rolling of the intermediate portion of the slab, instead of the opening correction control based on the function φ command, the opening correction wJa is performed based on the calculated opening correction amount value.

``Problems to be Solved by the Invention'' The amount of correction of the opening of the edger mill roll as described above should be determined from the mill constant, the amount of plate width variation, and the plastic constant in the width direction of the slab being rolled. However, at present, the plastic constants of the slabs are simply the values stored in pre-classified tables by copper mills, etc., and the correct plastic constants are not used for each slab to be rolled.
Therefore, it has not been possible to accurately control the opening degree of the edger mill rolls to be most suitable for each slab to be rolled.

"Means for Solving the Problems" The present invention is intended to solve the problems of the conventional art as described above, and its configuration will be explained with reference to FIG.

FIG. 1 shows an example of the final stand of a rough rolling line, where 1 is an edger mill, 2 is a horizontal mill, and 3 is a slab to be rolled.

When rough rolling the slab 3, the rolls of the edger mill 1 are set to an opening degree calculated in advance for each slab 3.

When the slab 3 is supplied to the edger mill 1, the slab 3
During width rolling of the leading end (and trailing end) of the roller, the roll opening of the edger mill 1 is corrected and controlled via the opening correcting device 5 based on a function command from the function generating command device 4.

During width rolling of the intermediate portion of the slab 3, instead of the opening correction control based on the function command, the roll opening is determined by the roll opening detector 6 of the edger mill 1 from the start of width rolling of the slab 3. An opening correction amount calculating device 8 stores the detected value and the width rolling load detected by the width rolling load detector 7, and calculates the roll opening correction amount of the edger mill 1 using a gauge meter method from these changes wJJffi. Based on the calculated value,
In the method of correcting and controlling the roll opening of the edger mill l via the opening correction device 5, the detected values from the roll opening detector 6 and the width rolling load detector 7 are taken in at a variable sampling period, And while calculating the quotient of both,
The plastic constant calculation value from the plastic constant calculation device 9, which calculates the plastic constant of the slurry and pulley 3 by averaging them, is given as a calculation input to the opening correction amount calculation device 8, and the opening correction amount is calculated. The calculated value of the opening correction amount by the device 8 is corrected.

"Effects of the Invention" As described above, according to the present invention, the amount of opening change ILII and the width rolling load fluctuation from the start of width rolling of the slab are used as calculation inputs to the edge mill roll opening correction amount calculation device. Since the plasticity constant calculated from the amount is given, it is possible to accurately control the opening degree of the edger mill roll that is most suitable for each slab to be rolled.

Incidentally, when comparing the width rolling of slabs by the method of the present invention (Figure 2) and the case of width rolling of slabs by the conventional method (Figure 3), it is found that the input of the edger mill is When using the method of the present invention, the amount of width variation of the side and exit side slabs is 3. The amount of width variation decreases from Ou to 4Z jlg, but when using the conventional method, it increases from 2.2u to 3.6IllI. It can be seen that the opening correction control of the suitable edger mill meal is not performed accurately.

In addition, in the case shown in Fig. 2 and the case shown in Fig. 3,
Although the lengths of the slabs are different from each other, other dimensions, specifications, and rolling schedules are the same for both, and the table value is λton/silk.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the control circuit of the method of the present invention, Fig. 2 is a graph showing the width variation of the slab and the movement of the edger mill roll when width rolling of the slab is performed by the method of the present invention, and Fig. 3 is a graph showing the movement of the edger mill roll. It is a graph showing the change in the width of the slab 1111ffi and the movement of the edger mill roll when the width of the slab is rolled by the conventional method. 1. Edge mill, 2. Horizontal mill, 3. Slab 4. Function generation command device, 5. Opening degree correction device. 6. Roll opening degree detector, 7. Width rolling load detector.

Claims (1)

[Claims] When rolling the width of the leading and trailing ends of the slab, the opening degree of the edger mill roll is corrected and controlled via the opening degree correction device based on the function command from the function generation command device, and the width of the middle portion of the slab is rolled. During rolling, instead of the opening correction control based on the function command, the edger mill roll is adjusted using a gauge meter based on the opening variation of the edger mill roll and the width rolling load variation from the start of width rolling of the slab. In the method of correcting and controlling the opening of an edger mill roll through the opening correction device based on the calculated value of an opening correction amount calculation device that calculates the opening correction amount of the opening correction amount and width rolling. The plastic constant of the slab is calculated from the load fluctuation amount by a plastic constant calculation device, the calculated plastic constant value is given as a correction calculation input to the opening correction amount calculation device, and the opening correction amount calculation device calculates the opening degree. A method for controlling the opening degree of an edger mill roll, comprising correcting a calculated value of a correction amount.